Shaft grinding tool



4 Sheets-Sheet 1 Filed Dec. 24, 1953 Cecil Lee Sylves ter IN V EN TOR.

y 4, 3956 c. L. SYLVESTER SHAFT GRINDING TOOL 4 Sheets-Sheet 2 FiledDec. 24, 1953 @ecil L98 Sylves ter IN V EN TOR.

HIS AGENT y 4, 1956 c. SYLVESTER SHAFT GRINDING TOOL 4 Sheets-Sheet 3Filed Dec. 24, 1953 Cecil Lee Sylvester IN V EN TOR.

HIS AGENT July 24, 1956 c. SYLVESTER SHAFT GRINDING TOOL 4 Sheets-Sheet4 Filed Dec. 24, 1953 Cecil Lee Sylvester INVENTOR.

BY Mme M2 HIS AGENT United States Patent SHAFT GRINDING TOOL Cecil LeeSylvester, Brownsville, Tex., assignor to Thelma Sylvester, Brownsville,Tex.

Application December 24, 1953, Serial No. 400,303

Claims. (Cl. 51-241) This invention relates to improvements incrankshaft grinders and more particularly to crankshaft grinderssuitable for grinding the crankpins of large industrial engines withoutremoving the crankshaft from the engine.

Various crankshaft grinders for grinding crankpins have been proposedheretofore, but these for the most part, were so designed as to maketheir use impractical on large engines such as used in power plants,compressor units and the like.

The present invention enables the crankpin bearing surface on thecrankshaft of an engine to be carefully and accurately ground withoutthe removal of the crankshaft from the engine.

It is an object of the invention to provide a crankshaft grinder forgrinding crankpins thereof, having an abrading element associatedtherewith for peripheral contact with the crankpin for grinding same,together with power means for rotating the abrading elementlongitudinally of the crankpin on the crankshaft.

Yet another object of the invention is to provide a crankpin grinder fora crankshaft which may be accurately and minutely adjusted from a remotepoint to remove any desired amount of material from the bearing surfaceof the crankpin and to provide a new, highly polished journal surface tocomplementarily fit a bearing element of a given size.

A still further object of this invention is to provide a crankshaftgrinding device for grinding crankpins whereby the crankpin will bespeedily and accurately ground to the correct size and the results ofthe grinding may be visually observed on a dial indicator during thegrinding operation.

Still another object of this invention is to provide a crankshaftgrinder for grinding crankpins whereby the crankpin of the crankshaft iscentered within a frame on centering rollers which ride upon the radiusof the fillet of the crankpin journal so as to grind crankpin true withrespect to the original axis.

Yet another object of the invention is to provide a crankshaft grindingdevice for grinding crankpins that has a guide frame to insure thegrinding of the cylindrical portion of the crankpin journal beingperpendicular to the end flange faces.

Another object of the invention is to provide a pneumatically operatedcrankshaft. grinding device for. grinding crankpins that may be insertedthrough a side plate opening in the engine housing or through an enginecylinder.

Yet a further object of the invention is to provide a crankshaft grinderfor grinding crankpins or other cylindrical objects, such as shaftingand the like.

With these objects in mind and others that will manifest themselves asthe description. proceeds, reference is to be had to the accompanyingdrawings, of which there are four sheets, in which:

Fig. 1 is a perspective view taken from above and from a side of thecrank shaft grinder, and showing the handl thereof resting on a supportmember; I

ice

Fig. 2 is a diagrammatic side elevational view of the device inoperating position to operate through a side of an engine housing, andshowing a motion study in dashed out-line;

Fig. 3 is a top plan view of the device with parts broken away andshortened to show the details of construction;

Fig. 4 is a side elevational view of the device with parts broken away,shown in" section, and shortened to show the details of consfruction;

Fig. 5 is a fragmentary elevational view with parts shown in section,and with parts broken away, of a con necting rod throw and showing thecentering rollers and the guide frame members in section;

Fig. 6 is a view similar to Fig. 5 but with the guide rollers shown inelevation and in the reverse position to that shown in Fig. 5;

Fig. 7 is a sectional view taken on the line 7-7 of Fig. 4, looking inthe direction indicated by the arrows, and with a portion of the teethof the rack and pinion shown in dashed out-line;

Fig. 8 is a perspective VlCW' through the handle support guide rollerand the mounting therefor;

Fig. 8A is a fragmentary view partly in section and partly in elevationof the handle support guide rollers and the mounting therefor;

Fig. 9 is a longitudinal sectional view, with parts shown in elevationand with parts broken away and shortened, through the handle portion ofthe grinding apparatus showing the details of construction thereof;

Fig. 10' is a sectional view taken onthe line 10-10 of Fig. 4'; lookingin the direction indicated by the arrows;

Fig. ll is a sectional viewtaken on the line 1111 of Fig. 9, showing themanner of retaining the thrust bearings in place;

Fig; 12 is a fragmentary top plan view of an adjusting screw fittedwithin the frame members for adjusting the abrading element relative tothe surface of the connecting rod bearing throw of the crank shaft.

Fig. 13 is a sectional view takenon the line 13-13 of Fig. 12, lookingin the direction indicated by the arrows; and

Fig. 14 is a fragmentary perspective view showing the universal mountingof the dial indicator standard.

With more detailed reference to the drawing, the numeral 20 generallydesignates the handle assembly, as is best illustrated in Fig; 9'. Theinner end of this handle receives a slidable member 21 that isbifurcated as indicated at 22 to saddle over frame member cross bar 24,as will best be seen in Figs. 1 and 9.

The frame member cross bar 24 has a reduced end or tenon portionindicated at 26', which engages slotted end or mortise 28 of arcuate"side frame members 30. The side frame members 30 have parallel outersides which are held in spaced relation by means of bars 24, 32, 34and36 that are rigidly secured in place by means of cap screws 38, asshown in Fig; 4, which pass through the respective bars and arescrew-threaded into the arcuate side frame-members 30 so as tohold theside frame members in parallel relation. At' least one of the side framemembers 30 is adjustable on the respective bars 24, 32, 34, and 36, uponloosening of cap screws 38 to enable the movement of the respective barsrelative to the side frame member, as will best be seen in Figs. 12' and13, and which will be more fully described hereinafter. It is tobepointed out that the bars 24; 3'2, 3'4, and 36 are of a selected,substantially correct length and only small adjustment is necessarybetween the bars an'd the respective side members; The side framemembers 30 each haveribsi 40' attachably' secured thereto by means ofcap screws 42, as will bestbe seen in Figs. 3 and 4, so as to maintain:the: arcuate side frame members 30 against spreading outwardly. Each: ofthe ribs 40 has an opening formed therethrough to permit relativesliding movement between arcuate side frame members and cross bar 34,when it is desirable to adjust the arcuate side frame members 3!longitudinally of the bars 24, 32, 34 and 36. The outer periphery ofeach side frame member 38 is transversely grooved at 33, 35 and 37 toreceive the respective cross bars 32, 34 and 36 in complementaryrelation.

Each of the respective cross bars has a slot 46 in each end thereof, aswill best be seen from Fig. 3, to adjustably receive cap screws 38, andeach of the side frame members 30 has radially disposed grooves 48 onthe inner face thereof to complementarily receive stems 50 which haverollers 51 mounted thereon at approximately 120 degree spacing. Each ofthe rollers 51 are preferably ball bearing mounted on shaft 52, as willbest be seen in Fig. 5. Each stem 50 is off-set at 53 near the inner endthereof so it may be reversed, as indicated in Fig. 6, with respect tothe position as shown in Fig. 5. Each stem 50 is held in place by meansof cap screws 54 which pass through a slotted portion thereof asindicated at 56.

The journal of the crank-throw is indicated at 58 and has a fillet 60 ineach end thereof that is tangent to the cylindrical portion of journal58 and to the inner side face 62 of bearing flange. The faces 62 areperpendicular to the cylindrical bearing face of journal 58, andtherefore the faces 62 are normally parallel.

The handle assembly, generally designated at 20, com prises a tubularmember 64 that has a key-way 66 at its inner end to complementarilyreceive a key 68 that interengages with rack bracket 70 that is securedagainst longitudinal movement by means of set screws 72, except when itis desired to adjust the bracket longitudinally of tubular member 64.With the bracket 70 held against relative rotary movement by key 68, thebracket may be moved longitudinally of the tubular member 64 and rack 74may be held in fixed relation with respect to tubular member 64 by setscrews 72, as will best be seen in Fig. 7. A longitudinally slidablemember 21 is interfitted in close sliding relation with tubular member64 and has a keyway 75 in which key 76 is fitted between the outerperiphery of the member 21 and the inner diameter of tubular member 64to hold the members 64 and 21 against relative rotation. The slidablemember 21 is welded or otherwise secured to an inner tubular member 78that extends partially through tubular member 64 and has a set screw 80passing through a sleeve 82 and into inner tubular member 78, so as tointerlock the sleeve 82 therewith and against relative longitudinal androtary movement. A hole 84 is provided in tube 64, as will best be seenin Figs. 4 and 10, to enable the removal of the screw 80.

The sleeve 82 is screw-threaded to receive threaded bolt 86, as willbest be seen in Fig. 9. The screwthreaded bolt 86 is interlocked with ahand knob 88 that is pinned to screw-threaded bolt 86 by means of a pin90 that passes through a knob 88 and through the screwthreaded bolt 86.Hand knob 88 has an inwardly extending projection 92 that has an annulargroove 94 therearound, which groove is adapted to receive a pair ofcomplementary arcuate keys 96, as will best be seen in Figs. 9 and ll.These keys prevent longitudinal movement in either direction of the handknob 88.

A bearing 98 is provided within tubular member 64 near the outer endthereof and in close fitting relation with the projection 92 of handknob 88. Set screws 100 pass through tubular member 64, bearing 98 andinto arcuate keys 96 which prevent arcuate keys 96 from movinglongitudinally so as to serve as a thrust bearing upon the turning ofhand knob 88. The hand knob 88 is preferably calibrated in of an inch,or in such other indicia as desired to indicate the longitudinalmovement of tubular member 64 relative to cross frame 24. The tubularmember 64 has a suitable complementary mark, such as indicated at 102 sothe indicia on hand knob 88 may be accurately read to enable the feedingof the grinding mechanism, generally designated at 104 into contactrelation with journal 58 of the crank shaft or other cylindrical memberbeing round.

The grinding element, as indicated in the present drawing, has a motor106 that is preferably of the pneumatically actuated type, which motoris slidably mounted on bracket 70 for transverse sliding movement onkeys 110 that are fitted in complementary relation with a key way formedin bracket 70 and base 198. A shaft 112 extends parallel along the sideof tubular member 64 and has a knurled hand wheel 114 on the outer endand a pinion 116 on the inner end, which pinion meshes with rack 74.

The shaft 112 is journaled within a base 168 and is guided within a slot169 in bracket 111, which bracket is secured near the outer end oftubular member 64, as is best seen from Figs. 1, 2 and 4. The motor 106is clamped to base 168 by means of an upstanding clamp 118 having bolt120 passing therethrough. The motor 186 has a right angle drive 122 atthe inner end through which a shaft 124 passes, which shaft is threadedat each end, as will best be seen in Fig. 3; An abrading element, suchas an emery, ruby, diamond, or other suitable abrasive stone 126 isbindingly secured on said shaft by means of a nut 128.

The motor 106 has a flexible conduit 130 attached thereto and extendingto a point near the outer end of tubular member 64 where a suitablecontrol valve 132 is mounted. The valve 132 is shown to be mounted onbracket 111 for the convenience of the operator. A suitable highpressure, pneumatic conduit may be attached to the valve 132 and to asuitable source of air supply. A dial indicator 134 is universallymounted on double clamps mounted on rod 136, which rod is off-set, asindicated in Fig. 14, and has a ball joint 138 on the lower end thereof.This is held in place by arms of a clamp 140 which enables furtheruniversal movement or turning movement to enable the dial indicator 134to be moved from side to side so that the plunger 135 may be so directedas to constantly track with the land being cut by the abrasive element126, thereby to give minute and accurate readings at all times of theamount of stock being removed by the abrading element 126.

The invention as illustrated in Figs. 1 and 2, is indicated as beingused through a side of the crank case housing of an engine and has abracket 142 secured to the side of an engine crank case housing 144 bymeans of bolts 146 that pass through slots 148 and are screw threadedinto housing 144. The slots 148 enable the angle bracket 142 to bereadily adapted to engines of various makes. A plate 150 is mounted ontop of angle bracket 142 and is secured in place by cap screws 152. aswill best be seen in Fig. 8. The plate may be raised or lowered by shimsso as to properly position ball bearing rollers 154 at the properheight.

The rollers 154 are mounted on angularly diverging axes 156 so as tosubstantiate a V-block of a rolling character, as illustrated in Fig.8A. The base 158, for these ball bearing rollers 154 is secured in placeby bolts 160 which pass therethrough and are screw-threaded into plate150. Suitable dowel pins 162 hold the base 158 in fixed relation toplate 150.

It is necessary that the peripheral face of abrading element 126 moveabsolutely parallel with respect to the journal 58, or other cylindricalsurface being ground and while the frame bar 24 is normally secured toarcuate side frame members 3% at right angles thereto, it is sometimesnecessary to adjust the frame bar member 24 with respect to arcuatemembers 30. A screw 164 has been provided, as shown in Figs. 12 and 13,which screw has an annular groove therearound, as indicated at 166. Ahalf threaded hole 168 is formed in tenon 26, which hole is threadedslightly deeper than the length of'screw 164. A key 170, as indicated inFigs. 12 and 13, passes transversely through the annular groove 166 andextend'salong a slot 172 formed in the inner side of mortise '28, whichslot 172 is slightly larger than half the outside diameter of screw 164,and is sufficiently' long to permit longitudinal sliding movement ofcross frame member 24 relative to one of the arcuate side frame members30, as will best be seen in Fig. 12. The tenon 26 has a slot 174 thereinthat is enlarged both longitudinally and transversely to permitlongitudinal shifting of cross frame member 24 relative to arcuate sideframe member 30, as will best be seen in Fig. 12. This arrangement willalso enable vertical movement of tenon 26 relative to arcuate framemembers 30, as will best be seen in Fig. 13.

The bracket 70 may be adjustably secured in place on tubular member 64bymeans of set screws 72. The tubular member 64 is secured againstlongitudinal sliding movement on slidable member 21 by means of a setscrew 77 which is threaded through bracket 70 and bindingly engages key76. With the bracket secured in this manner, the abrading wheel 126 maybe passed transversely of the face of the crankpin parallel to theoriginal axis thereof.

A clamp bolt 107, as shown in Fig. 7', is provided to bindingly engagebase members 108 with bracket 70. The bracket 111 is secured in place ontubular member 64 by means of set screws 113.

Operation.

To grind the crank throw of an engine of the large industrial type,which has side plates on the crankshaft housing, the desired plate orplates are removed and the connecting rod removed from the particularthrow to be ground. Then cross frame bar member 24, and cross bars 32,34, and 36 are selected, to be of alength substantially the same orslightly shorter than the width of the crankpin journal to be ground,which journals are often twelve to fourteen inches in length. Arcuateside frame members 30 are then selected that have sufiicient arcuatesize to pass over the throw of the crankshaft and have sufii'cient spaceto receive rollers. 51 mounted on stems 50, so that the rollers can becentered around crank throw or shaft 58. The frame cross bar member 24and cross bars 32, 34, and 36 are bolted onto arcuate side frame members30 by means of cap screws 38, and with the arcuate side frame members 30moved outward against the inner'faces of the bearing flanges 62, andsince these faces are parallel with each other and have a factoryfinish, and with the frame member crossbar 24 and cross bars 32, 34, and36 tightly secured in place, the frame will present a rigid framestructure.

The adjusting screw 164 may be turned by insertion of a wrenchthereinto, which wrench maybe turned until bar 24 is parallel with thetop surface of the shaft. At least one of the frame members 30 ismovable longitudinally of cross bar frame member 24, upon. loosening ofbolts 38. When the proper adjustment hasbeen made, these bolts are againtightened tohold the parts fixed. in adjusted relation.

It is preferable to have the roller stems 50 calibrated along a sidethereof, as indicated in Figs. 3 and 6, to aid in the setting of therollers 51 with respect to the inner diameter of the arcuate side framemembers 30. With the rollers 51 at each end of the journal or shaft 58correctly adjusted about the diameter of the shaft 58,. which shaft maybe in excess of twelve inches indiameter, as indicated in Fig. 5, andwith the corners of the rollers 51 riding on factory formed fillets 60,.which usually are free of wear at approximately mid-point thereof, theunit comprising side frame members 30, framemembercross bar 24, crossbars 32, 34, and 36'will be maintained in a journaled relation withrespect to the exact, true, original axis of the shaft, regardless ofthe wear. on the intermediate shaft 58 forming the bearing surface. Withthe frame of the grinding element thus fitted, and with the slidablemember 21' bolted in place by means ofcap screw 23, as will best be seenin Figs. 4 and 9, and with the rack bracket 70 mounted on tubular stem64, as is best seen in Figs. 4 and 7, the rack bracket is movedlongitudinally therealong on key 68 to the desired adjusted position andset screws 72 are tightened to rigidly hold the rack bracket in place.

The motor 106, which carries the abrading element 126, may be movedtoward or away from the peripheral face of the crank pin journal, by theturning of hand knob 88 the desired amount, whereupon, a set screw maybe used to interlock the calibrated hand knob 88 with respect to thesleeve 64 to prevent rotary movement of the knob, thereby holding theabrading element in a fixed, radial relation relative to the crank pinjournal while the abrading element is passed longitudinally back andforth across the face thereof to bring the journal to the correct size.

For the most accurate truing of the crank pin journals, the rollers 51should ride on the concave surface of fillets 60 so as to maintain theframe in true concentric relation to the original axis of the crank pinjournal, or such other journal as is being ground. In this manner, theabrading elements are maintained in true relation. with respect to thefillets which are usually free of wear, thereby enabling the grinding ofa concentric journal.

The dial indicator 134 mounted on rod 136, which rod is held in fixedrelation with respect to the mounting thereof when set on its universalmounting with respect to bracket 140 (Fig. 14) and upon rotation of theshaft 58 at a relatively slow speed, the dial indicator will give theeccentricity of the shaft with respect to the original, true axis, andthen, by carefully moving the dial indicator 134 from side to side bymeans of hand wheel 114, the high places on the shaft may beascertained, to enable the initial grinding operation to be made by thegrinding wheel 126. With the plunger or feeler element of the dialindicator 134 in circumferential alignment with the land" to be cut bythe abrading element 126, the hand nut is turned so that the screwelement 86 will move the tubular element 64 inward on slidable member21, so the abrading Wheel 126 will engage the peripheral face of shaft58, and by regulating the supply of air to the motor 106 by means ofvalve 132, the high spots will be ground from the face of the shaft uponrotation of the shaft, as indicated in Fig. 2, and with a centering rest154 bolted to the crank case housing as indicated. in Fig. 8, therollers 154 will permit inward and outward movement of the tubularelement 64 in a pattern, such as indicated in Fig. 2.

Slots 143 are provided in angular member 142 to permit relativeadjustment longitudinally along the face of the opening of crankshafthousing 144.

The present device is designed to grind more than onehalf of the widthof the crankpin bearing surface by the abrading element 126, on one endof the shaft 124. When the peripheral face of shaft 58 has been groundto a uniform diameter with respect to the original, true axis of theshaft, the abrading wheel is then removed from that particular end ofthe shaft and fitted on the opposite end of the shaft where it issecured in place by means of nut 128, and the dial indicator 134 isshifted on universal ball joint 138 so that the plunger 135 will trackwith the land being ground, and the operation of grinding the high spotsfrom the shaft is repeated until the shaft is brought uniformly to thesame diameter of the first portion that was ground, and since the rack74 permits movement over more than one-half the width of the crankpinbearing face, the shaft 58 may be brought to uniform diameter throughoutthe entire width of the cylindrical bearing surface in this manner.Since the shaft is trued to the original axis of the bearing, the stem50 may be removed from the radial slots 48, in arcuate side framemembers 30 and the stems reversed to occupy the position as. shown inFig. 6, with the peripheral face of rollers 51 engaging a true cylindrical bearing surface of the shaft 58 that has been trued with respectto the original axis, and with the arcuate side frame members 30adjusted with respect to shaft 58 the fillet 60 may be ground true withrespect to the original axis of the shaft 58, and the lower end of thefillet feathered so as to obviate any abrupt shoulder, thereon, and thefillet 60 may be ground truly tangential with the face 62 on the bearingflange; in this manner a grinding job may be performed on the crankshaftwithin the engine with substantially the same amount of accuracy as whenoriginally ground at the factory. When a shaft is ground in the mannerdescribed above, the shaft is trued with respect to the original axis byhaving the guide rollers 51 roll on the arcuate surface of the fillets6t) and the roller is held in guided relation by the contact of thearcuate side frame members 3% with the inner parallel faces 62 of thehear ing flanges and since the measuring that is performed on the shaft58 is such that the high and low spots of the shaft may be determined inadvance of the actual grinding operation and so noted, then the actualgrind ing operation is performed under minute control, with the dialindicator indicating the depth of the cut of the abrading element, aminimum of metal may be removed from the shaft to give a truecylindrical bearing sur face on the shaft that is cylindrical withrespect to the original axis of the shaft.

While the invention has been described and illustrated in some detailwith respect to grinding the throws of cylindrical crankshafts, it is tobe pointed out that it may be successfully used for surfacing andpolishing shafts, such as line shafts and the like that are rotatedeither on centers or on journaled bearings, by ones fitting the grindingdevice about a shaft with the rollers 53. sub stantially centering theshaft within arcuate side frame members 30, whereupon the abradingelement 126 may be moved longitudinally along the shaft by means of handwheel 114, and the handle adjusted on rollers 154, or the entire devicemay be urged manually longitudinally of the shaft as the grinding andpolishing operation is performed, since the outer sides of the arcuateside frame members 30 will not be in engagement with flanges, with thedial indicator indicating the amount of stock being removed as it isremoved from the shaft.

It is to he understood that changes in the details of construction maybe made without departing from the spirit of the invention or the scopeof the appended claims.

Having thus described the invention, what is claimed 1. A shaft grindingtool comprising: a pair of side frame members having a throat topartially encircle a shaft, cross bars connecting said side framemembers and attachably secured thereto, a stem attached to one of saidcross bars and extending outwardly therefrom substantially at rightangles thereto, a second stem complementarily engaging said firstmentioned stem and being slidably mounted thereon in longitudinalsliding rela tion with respect thereto, a transverse bracket secured tosaid second mentioned stem near the end adjacent said side framemembers, a base mounted on said bracket for longitudinal slidingmovement with respect thereto, a motor mounted on said base for movementtherewith, an abrading wheel mounted on said motor for rotation thereby,guide means mounted on each of said side frame members and projectinginwardly at spaced intervals around the inner surface of said throat forjournaling a shaft therein for turning movement with respect thereto,means for adjustably moving said base carrying said motor longitudinallyalong said bracket, and further means for adjustably moving said secondmentioned stem and said motor carrying said abrading wheellongitudinally of said first mentioned stem.

2. The device as defined in claim 1; which includes parallel outer faceson said side frame members, which parallel faces are adapted to fit inbearing relation with parallel faces of the flange at each end of thecrank shaft journal being ground.

3. The device substantially as set forth in claim 2; wherein, said sideframe members, in addition to being attachably secured to the crossbars, are adjustably secured thereto, and wherein the guide means arerollers.

4. The device as defined in claim 2, wherein, said second stem istubular and is telescoped over said first mentioned stem and guiderollers mounted below and in contact relation withsaid tubular stem tosupport said tubular stem for reciprocating movement.

5. A crank shaft grinding tool adapted to grind the journal of a crankshaft which journal has a flange at each end thereof, the faces of whichflanges are parallel and each has radial fillets thereon: which toolcomprises a pair of spaced apart side frame members having the outer endfaces thereof parallel, said side frame members each having an openthroat formed therein, the outer end faces of each of said side framemembers being adapted to fit in abutting relation with the respectiveparallel flanges of the crank shaft being ground when the tool is fittedthereon, cross bars connected to said side frame members and attachablysecured thereto, a stem attached to one of said cross bars and extendingoutwardly therefrom at substantially right angles thereto, a second stemmounted on and being slidable with respect to said first mentioned stem,a transverse bracket secured to said second mentioned stem, a rackmounted on said bracket, a base mounted on said bracket for slidingmovement longitudinally of said bracket, a motor mounted on said base, apinion rotatably mounted on said base and interengaging said rack onsaid bracket, a shaft connected to said pinion and extending outwardtherefrom, means on said shaft for rotating said pinion, an abradingwheel mounted on said motor, and means for adjusting said motor carryingsaid abrading wheel longitudinally with respect to said first mentionedstem.

6. The device substantially as set forth in claim 5, wherein; means areprovided for selectively locking said first mentioned stem and saidsecond mentioned stem against relative longitudinal movement.

7. The device as defined in claim 5, which includes indicator meansmounted on said transverse bracket in peripheral alignment with saidabrading wheel and rearwardly thereof, in position to ride on thesurface of the shaft being ground.

8. A crank shaft grinding tool adapted to grind the journal of a crankshaft, which journal has a flange at each end thereof, the faces ofwhich flanges are parallel and each having radial fillets thereon: whichtool comprises a pair of spaced apart side frame members, the outer endfaces of said side frame members being parallel, cross bars attachablyand adjustably connecting said side frame members together, a sternattached to one of said cross bars and extending outwardly therefromsubstantially at right angles thereto, a second stem mounted and beingin sliding relation with respect to said first mentioned stem, a bracketsecured to said second mentioned stern, a motor having a shaft, saidmotor being mounted on said bracket of said second mentioned stem,roller centering means mounted on said side members and adapted to beengaged with the fillets of the crank shaft being ground, so as tocenter said side frame member with respect to the shaft being ground, anabrading wheel secured on the shaft of said motor, means fortransversely adjusting said motor carrying said abrading wheel withrespect to the axis of said first mentioned stem, and means for movingsaid motor, carrying said abrading wheel, longitudinally of said firstmentioned stem.

9. The device substantially as set forth in claim 8, wherein; means isprovided for adjusting the angularity of at least one of said cross barswith respect to the parallel faces of said side frame members.

10. A crank shaft grinding tool adapted to grind the journal of a crankshaft which journal has a flange at each end thereof, the faces of whichflanges are parallel and each has radial fillets thereon: which toolcomprises a pair of spaced apart side frame members each having an openthroat, the outer end faces of each of said side frame members beingparallel, cross bars connecting said side frame members and attachablyand adjustably secured thereto, a stem attached to one of said crossbars and extending outwardly therefrom substantially at right anglesthereto, a tubular member telescoped over said stern and slidablymounted thereon in longitudinal sliding relation with respect thereto, abracket secured to said tubular member near the inner end thereof, apneumatic motor, which motor has a shaft, said motor being slidablymounted on said bracket for transverse movement relative to the axis ofsaid tubular member, guide means mounted on each of said side framemembers for journaling a shaft to be ground therein for turning movementwith respect thereto, an abrading wheel secured to the shaft of saidmotor, means for adjustably moving said motor transversely with respectto said tubular member, and means for adjustably moving said motorcarrying said abrading wheel longitudinally of said stem.

11.' A crank shaft grinding tool as set forth in claim 10, wherein; aroller guide means mounted below and in bearing relation with saidtubular stem to support said tubular stem for reciprocating movement.

12. A crank shaft grinding tool adapted to grind the journal of a crankshaft which journal has a flange at each end thereof, the faces of whichflanges are parallel and each has radial fillets thereon: which toolcomprises a pair of spaced apart side frame members each having an openthroat, the outer end faces of each of said side frame members beingparallel, cross bars connecting said side frame members, said cross barsbeing attachably and adjustably secured to said side frame members, astem attached to one of said cross bars and extending outwardlytherefrom substantially at right angles thereto, a tubular membertelescoped over said stern and slidably mounted thereon for longitudinalmovement with respect thereto, a bracket secured to said tubular membernear the inner end thereof, a motor slidably mounted on said bracket fortransverse movement relative to said tubular member, guide means mountedon each of said side frame members for journaling a shaft therein forturning movement with respect thereto, an abrading wheel on said motor,means for adjustably moving said motor transversely with respect to saidtubular member, a calibrated hand knob for adjustably moving said motorcarrying said abrading wheel longitudinally of said stem, and

means on said tubular member to indicate the relative 5 position of saidhand knob.

13. A crank shaft grinding tool as set forth in claim 12, wherein; ashaft mounted transversely with respect to the axis of said tubularmember and being connected in driven relation to said motor and has theends thereof extending outwardly therefrom, each end of said shaft beingadapted to receive an abrading wheel thereon, and means for securing anabrading wheel selectively to an end of said shaft for rotationtherewith.

14. A crank shaft grinding tool substantially as set forth in claim 13;wherein, the peripheral face of said abrading wheel adapted to engagethe shaft being ground, with the axis thereof substantially parallelwith the axis of said shaft being ground.

15. A crank-shaft grinding tool for grinding journals of a crank shaft,each of said journals having a flange at each end thereof, the faces ofwhich flanges are parallel, a radial fillet intermediate each of saidflanges and the respective journals, comprising: a pair of side framemembers each having an open throat, the end faces of each of said sideframe members adjacent said flanges being parallel and adapted to fit inbearing relation with said flanges, and which side frame memberspartially encircle said shaft, ribs on the periphery of said side framemembers and extending outwardly therefrom, cross bars connecting saidside frame members and attachably secured thereto, a stem attached toone of said cross bars and extending outwardly therefrom substantiallyat right angles thereto, a second stem complementarily engaging saidfirst mentioned stem and being slidably mounted thereon in longitudinalsliding relation with respect thereto, a transverse bracket secured tosaid second mentioned stem near the inner end thereof, a base mounted onsaid bracket for longitudinal sliding movement with respect thereto, amotor mounted on said base for movement therewith, an abrading wheelmounted on said motor for rotation thereby, guide means on each of saidside frame members and projecting inwardly into said throat at spacedintervals around the periphery thereof for journaling a shaft thereinfor turning movement with respect thereto, means for adjustably movingsaid base carrying said motor longitudinally along said bracket, andfurther means for adjustably moving said second mentioned stem and saidmotor carrying said abrading wheel longitudinally of said firstmentioned stem.

References Cited in the file of this patent UNITED STATES PATENTS879,277 Landis Feb. 18, 1908 2,109,292 Hribar Feb. 22, 1938 2,321,081Hanrahan June 8, 1943

